As is the way with Vim, there are a ton of features, but stumbling on the combination of commands that does what you want can be a bit difficult sometimes. In this case, the objective is to perform a search and replace over some files.
This is done in two steps: loading up the files to process, then issuing a command to run on each of the files.
Load up the files to search using the args command. This command
supports multiple arguments and can use bash-style path completion.
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Perform a replace using sed-style syntax using the argdo command. This
command iterates over all the files loaded by the args command and
performs a command on them. In this case, it's performing the replace
operation.
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The flags used in this case are:
- g: global search (find more than a single occurance per line)
- e: suppress "string not found" error messages
- c: confirm each replace
Running update after the replace operation saves any changes to the
file before moving to the next one.